console.log(module.exports===exports);

const circle = require("./08_commonjs_circle");
console.log(`圆的面积：${circle.area(4)}`);

const circle_area = require("./08_commonjs_circle").area;
console.log(`圆的面积${circle_area(4)}`);

const {area} = require("./08_commonjs_circle");
console.log(`圆的面积${area(4)}`);

const square=require("./08_commonjs_square");
console.log(`正方形的面积：${square.area(4)}`);

const {area : square_area}=require("./08_commonjs_square");
console.log(`正方形的面积：${square_area(4)}`);